Question

уравнение: 25-3b=9-5b

Answer 1

-3b+5b = -25 +9

2b = -16

b= -16\2

b= - 8

Answer 2

25-3b=9-5b

-3b+5b=9-25

2b=-16

b=-8

Проверка:

25-3*(-8)=9-5*(-8)

25-(-24)=9-(-40)

25+24=9+40

49=49